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《High Voltage Engineering》 2005-03
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Calculation of Leakage Reactance for a Transformer Windings with Uneven Distribution of magnetic Force

LI Xiaoshong 1,2, CHEN Qiaofu1, LI Ronghua 2, LONG Guzhong3 (1. School of Electrical and Electronics Engineering, Huazhong University of Sci ence and Technology, Wuhan 430074, China; 2. Hunan Institute of Science and Te chnology, Yueyang 414000, China; 3. CSR Electric Motor Co., Ltd, Zhuzhou 41200 1, China)  
The transformer windings which are made of pancake a nd helical coils for the primary and the secondary respectively have uneven distri bution of magnetic-force, and produce the radial component of magnetic field wh ich should be considered in the calculation of leakage reactance. In this paper, a leakage reactance calculation is done in the transformer windings with the ab ove configurations and concentrically arranged "HV-LV-HV" on a core limb, and an equivalent transformation is proposed about the uneven distributed magnetic f orce, furthermore, the effect is analyzed on the leakage reactance by the coil p ancake number and the gap lengths among coil pancakes. The investigation shows t hat the fewer the number of the coil pancakes, the faster the leakage reactance changes with the gap lengths among coil pancake number. When coil pancake number reaches some value, the leakage reactance changes little with the gap lengths. Finally the method is verified by the result based on the calculation of leakage magnetic field distribution by finite element method (FEM).
【Key Words】: equivalent transformation of uneven distributed magne tic force leakage reactance calculation FEM
【CateGory Index】: TM426
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